[2][3] His father played in the NHL for 15 seasons and won back-to-back Stanley Cup championships with the Detroit Red Wings in 1997 and 1998,[4] while his uncle Greg played professional ice hockey in North America and Europe for 11 years before retiring to help coach the Boston College Eagles men's ice hockey team.

[10] He spent the majority of his tenure in the Hurricanes' organization with their American Hockey League (AHL) affiliate, the Charlotte Checkers, where he was team captain from 2016 to 2019 and won a Calder Cup in 2019.

[11] After spending the first five seasons of his professional career within the Hurricanes organization, Brown left as a free agent to sign a two-year, $700,000 contract with the Vegas Golden Knights on July 1, 2019.

[18] On March 3, 2023, the Flyers traded Brown to the Ottawa Senators in exchange for a sixth-round pick in the 2023 NHL entry draft.

[21] As a free agent from the Senators, Brown was signed to a two-year, $1.6 million contract to join his fifth NHL club, the Boston Bruins on July 1, 2023.

[26] Afterwards, Brown spent most of the rest of his season in Providence, having two brief call ups to the NHL squad in late December and January which totaled three games.

[27] On May 5, 2024, Brown was called back up to the NHL ahead of the Bruins second round Stanley Cup playoffs series against the Florida Panthers.

[32] Brown's younger brother Christopher also played at Boston College, and was captain during his junior and senior seasons.

[33] Brown's maternal grandfather is Wellington Mara, longtime owner and president of the NFL's New York Giants.